使用Retrofit和PHP API上传图像

public interface ImageUploadApi {
    @Multipart
    @POST("upload.php")
    Call<ResponseBody> uploadImage(@Part MultipartBody.Part image);
}

// 创建Retrofit实例
Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://example.com/") // 替换为实际的API地址
        .build();

// 创建API接口的实例
ImageUploadApi api = retrofit.create(ImageUploadApi.class);

// 创建图像文件的RequestBody
File file = new File("path/to/image.jpg");
RequestBody requestBody = RequestBody.create(MediaType.parse("image/*"), file);

// 创建MultipartBody.Part，用于包装图像文件的RequestBody
MultipartBody.Part imagePart = MultipartBody.Part.createFormData("image", file.getName(), requestBody);

// 发送图像上传请求
Call<ResponseBody> call = api.uploadImage(imagePart);
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        // 处理上传成功的响应
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理上传失败的情况
    }
});

<?php
$targetDir = "uploads/"; // 图像文件保存的目录
$targetFile = $targetDir . basename($_FILES["image"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($targetFile, PATHINFO_EXTENSION));

// 检查图像文件的有效性
if (isset($_POST["submit"])) {
    $check = getimagesize($_FILES["image"]["tmp_name"]);
    if ($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}

// 检查图像文件是否已存在
if (file_exists($targetFile)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}

// 限制图像文件的大小
if ($_FILES["image"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}

// 允许上传的图像文件格式
$allowedTypes = array("jpg", "jpeg", "png", "gif");
if (!in_array($imageFileType, $allowedTypes)) {
    echo "Sorry, only JPG, JPEG, PNG, and GIF files are allowed.";
    $uploadOk = 0;
}

// 检查上传过程中是否出错
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
} else {
    if (move_uploaded_file($_FILES["image"]["tmp_name"], $targetFile)) {
        echo "The file " . basename($_FILES["image"]["name"]) . " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>